JPH0344360B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a device for transmitting signals between receivers by means of a conductor surrounded by an insulating cover, the conductor being sealed at one end in a moisture-proof manner. A projecting body made of an insulating material is provided, and a plug is provided at the other end, and the plug serves as an electrical contact.
This invention relates to a device having a protector made of insulating material injected around a portion of the contact and the end of the conductor.

Devices of this type, which include a conductor provided with a plug with contacts at both ends, have traditionally been used in the electronic field. In this case, the conductor serves, for example, as a connection between a measuring device and an oscilloscope. In addition, this type of conductor is used in automobiles to enable monitoring of functions corresponding to automobile equipment.
Examples of uses include top dead center transmitters and brake anti-skid systems. Future developments in this field will include the use of microprocessors to monitor other points in the vehicle's systems. These points are, for example, ignition angle, ignition signal, breaker contacts, rotational speed, speed and automatic converter.

All applications in electronic technology require that signals can be transmitted by conductors from a transmitter to a receiver without problems. Conventionally, this has required the use of completely shielded conductors, and it has also been necessary to completely shield each piece of equipment and place it inside a capsule. In particular, there were problems when shielding the microprocessor. The reason is that the metal conductor protruding from the shield acts like an antenna and generates a corresponding interference signal to the microprocessor. Fully effective shielding for conductors and equipment is particularly expensive. A corresponding system would still require considerable cost.

SUMMARY OF THE INVENTION An object of the present invention is to provide a device that has a simple structure, is versatile, and guarantees signal transmission between transmitters by conductors without any interference. In this case, not only should there be no interference from an electrical point of view, but the conductor should also be moisture resistant.

This problem is solved in a device of the above-mentioned type as follows. - the conductor is formed as a light guide, - the socket provided for connection to the receiver has a light-sensitive receiver, an amplifier and a pulse former, which are connected in series between the light guide and the contacts, and embedded in the protective body, - embedded in the projectile body an electronic/optical converter and a magnetic pulse generator arranged electrically in series therewith, the pulse generator being actuated by the varying magnetic field; The problem is solved by providing the transmitter with a device for generating a fluctuating magnetic field, and placing the projectile in its immediate vicinity.

By applying a device of this type containing a light guide, the receiver and transmitter become non-electrical during signal transmission. Since the signal is transmitted via the light guide, it is independent of any electromagnetic interference. Conductors of this type are also suitable for shielding microprocessors, in which case the light conductors do not generate radio waves and therefore do not cause disturbances.

Conductors formed by injection bodies and inserts are easily manufactured using today's injection molding technology. With this technique, the light guide is first provided with its insulating cover. This covering is carried out continuously, with the covered light guide being wound up endlessly onto a spool. Since it is endless, it can be cut to the desired length to create a suitable conductor for the device, and an injection molding or insert can be made at the end. For this purpose, after electrical connection, on the one hand, the transducer and pulse generator are assembled for the injection body, and on the other hand, the transmitter, amplifier and pulse generator are combined for the plug and are fixed in a unique manner to the end of the conductor. Ru. The conductor end treated in this way is placed in an injection tool, into which the injection body and the plug-in protector are injected. In this way, a conductor for connecting the transmitter and receiver is formed. This conductor is not only unaffected by electromagnetic disturbances, but also has moisture resistance. This is because the conductor itself as well as its ends are completely moisture-resistant due to the injection process.

A pulse generator suitable for the device according to the invention is described, for example, in DE 21 43 327 A1. This pulse generator is hereinafter referred to as a "Viegandsonde". A Wiegandsonde consists of a magnetic core made of two materials, which is surrounded by wire. The varying magnetic field acting on the Wiegandsonde produces a pulsed current that is independent of the speed at which the magnetic field moves. The device according to the invention has the advantage that, in principle, no power source is required on the transmitting side. The projectile body does not have outwardly projecting contacts, but rather surrounds them. The reason for this is that both the Wiegandsonde, which serves as a power source, and the transducer can be completely embedded within the projectile.

The structure on the transmitter side, including the transducer and the Wiegandsonde, is sufficient in principle for the functioning of the device according to the invention. As converters, for example light emitting diodes or laser diodes are used, which have a threshold voltage. In order to improve the sensitivity, this transducer may be provided with an additional separate power supply that produces just a threshold voltage within the projectile. This power source can be, for example, a Zener diode, which receives the current from the outside and brings out the contacts from the injection body. However, if you connect a capacitor in series with the converter,
A capacitor is charged via a diode with a low threshold voltage, otherwise not required, by the counter pulse of the Wiegandsonde.

The invention will be explained in more detail on the basis of the following illustrated embodiments.

The device according to the invention can be applied wherever a signal is to be transmitted from the transmitter to the receiver without interference when transmitter and receiver are electrically decoupled at the same time. The embodiments described below are representatively described with respect to an automobile.

For example, a microprocessor installed under the hood of a car is indicated by 1. The microprocessor 1 has a different plug-in joint 2 and is surrounded by a shield indicated by a dotted line 3, which also protects the microprocessor 1 itself against electromagnetic disturbances. In the illustrated example,
Connected to the five bayonet fittings 2 are conductors 4, which are connected to a device 5 at their free ends. The conductor 4 is arbitrarily long and is therefore shown cut away in FIG.

The devices 5 are installed, for example, in the following locations of the vehicle: ignition angle control, ignition signal transmitter, breaker contact, rotational speed measurement location, speed measurement location, transmission control point, top dead center transmitter (OT). , automatic anti-skid system (ABS) for the brakes. At all these locations there is provided a projectile body containing a Wiegandsonde, which responds to a varying magnetic field, the signals of which are transmitted via conductor 4 to microprocessor 1 and evaluated there. The microprocessor 1 is provided with any number of bayonet connections 2, so that it is theoretically possible to connect an electronic viewing position in a motor vehicle to the microprocessor 1 by means of conductors 4.

The conductor 4 itself can be constructed in accordance with FIGS. 2 and 3.

The signal transmission element is designed as a light guide 6, which is provided as an elongated element with an insulating cover 7 over its entire length. This insulating cover is applied continuously to the light guide 6 using a general-purpose injection molding machine, and the covered light guide is endlessly wound onto a spool. As material for the insulating cover 7, any plastic is suitable, for example polyethylene or polyvinyl chloride.

The light guide 6 can be constructed as a glass fiber or a plastic fiber. In this case, a single conductor may be used, or a bundle of mutually twisted fibers may be used. When using this bundle, it can be made thinner than a single wire.

To manufacture the conductor 4, a predetermined or desired length is first taken from an endless conductor. The insulating cover 7 of the light guide 6 is removed at both ends. On the one hand, the injection body 8 and on the other hand the insert 9 are molded onto this free end. The plug-in has electrical contacts 10 which are fixed in bridges (not shown) made of mechanically strong insulating material and are held at a distance from one another.

A Wiegand sonde 11 and an electronic/optical converter 12 are embedded within the projectile 8 and are electrically connected in series. Electron/optical converter 10
is in particular designed as a light-emitting diode or a laser diode. In principle, any suitable electronic/optical converter can be applied. The projectile body 8 is provided at one of the monitoring points (transmitter) and is equipped with a magnet 13 as shown in FIG.

The magnet 13 may be an elongated magnet or an electromagnet. If a magnet 13 is provided on the movable part of the monitoring point, a fluctuating magnetic field is generated by movement relative to the fixed point to which the Wiegand sonde 11 is attached. The magnet 13 can be installed, for example, in a continuously rotating distributor in an automobile.

However, by positioning the magnet 13 itself and coupling the magnetic shorting device to the point to be monitored or to a moving part of the equipment,
It is also possible to short-circuit the magnetic field at predetermined intervals, thereby effecting the desired change in the magnetic field.

On the other side of the conductor 4, a plug 9 is injection molded, which is suitable for connecting to the microprocessor 1. A photosensitive receiver 14 , an amplifier 15 and a pulse former 16 are connected to the contacts 10 of the plug 9 and are connected in series to the light guide 6 . A more accurate circuit of this part is shown in FIG. The members 10, 14, 15, 16 are introduced together with the conductor ends into an injection molding apparatus, where a protector 17 made of an insulating material is injection molded to enclose the conductor ends in a moisture-proof manner. After injection molding the injection body 8 and the protector 17, which are injection molded in only one working step, the conductor 4 is completed.

The contact 10 can also be formed as a plug-in. However, it is also possible to design it as a socket contact that can be plugged into a pin of the microprocessor 1. For example, a photodiode or a phototransistor can be used as the photosensitive receiver 14.
Both the amplifier 14 and the pulse shaper 16 can be formed as so-called integrated circuit ICs. This integrated circuit must be able to be connected to corresponding contacts. Furthermore, receiver 14 and amplifier 15 can be housed within an integrated circuit.

The plug 9 in FIG. 4 has three contacts 10, the central contact 10 for signal transmission and the other contacts for power supply. According to FIG. 4, the receiver 14 is connected to the input of an amplifier 15, which is connected on the other hand to a pulse former 16.

The varying magnetic field of the magnet 13 produces positive and negative pulsed currents from the Wiegandsonde 11 independent of the speed at which the magnetic field change is performed. The positive pulse current is used for monitoring or signal transmission. This pulsed current is converted by converter 12 into an optical signal, which signal is sent to microprocessor 1 via conductor 4.

As already mentioned, a photodiode is used in particular as the converter 12. This type of diode has a threshold voltage of about 1.2V. A power supply may be provided in series with the converter 12 to ensure that this device voltage is overcome by the pulsed current of the Wiegandsonde 11. This power supply can be a Zener diode 18, which can be connected to the power supply via contacts 19 and 20 which project from the injection body 8, the contacts projecting from the injection body 8 in a moisture-proof manner.

A capacitor 21 may be used as the power source, which is charged via a diode or transistor 22 by the negative pulse current of the Wiegand sonde 11. As the diode 22 connected anti-parallel to the converter 12, a diode with a low threshold voltage, for example a germanium or silicon diode, is used. In this embodiment, the fully shielded projectile 8 with non-protruding contacts
It also has the advantage of not requiring any additional power supply.

Overall, it provides a robust, easy-to-handle, moisture-resistant conductor 4, which allows signal transmission between transmitter and receiver without electromagnetic interference, so that the conductor is free from interference, e.g. It can also be useful for receiving messages that are difficult to receive. The device according to the invention, as already mentioned, is not limited to automotive technology, and today it is possible to achieve interference-free reception and/or interference-free signal transmission, which is only possible with the expensive shielding of conductors and equipment. Applicable to all possible devices required.

[Brief explanation of drawings]

FIG. 1 is an overall view of the device according to the invention, FIG. 2 is an enlarged view of the conductor, FIG. 3 shows the cross-sectional line of FIG. 2, and FIG. 4 shows details of the insertion on the receiver side. 5 and 6 show detailed circuits of the projector on the transmitter side. Reference numbers in the figure, 4... Conductor, 6... Light guide, 9
... Plug, 10 ... Contact, 11 ... Pulse generator, 12 ... Converter, 14 ... Receiver, 15 ...
Amplifier, 16... Pulse former, 17... Protector.

Claims (1)

[Claims] 1. A device for transmitting signals between a transmitter and a receiver using a conductor surrounded by an insulating cover, and one end of the conductor is covered with an insulating material that seals the conductor in a moisture-proof manner. an injector having an injected body at the other end, the inset having an electrical contact and a protective body consisting of an insulating material injected around a part of the contact and around the end of the conductor, wherein - the conductor is - a plug-in 9 designed for connection to the receiver has a light-sensitive receiver 14, an amplifier 15 and a pulse former 16, which are connected in series between the light guide 6 and the contact 10; , and embedded in the protective body 17, - embedded in the injection body 8 an electronic/optical converter 12 and a magnetic pulse generator 11 arranged electrically in series therewith, the pulse generation thereof being embedded; The device generates a pulsed current by the action of a fluctuating magnetic field, - the transmitter 5 is provided with a device for generating the fluctuating magnetic field 13, and the projector 8 is provided in the immediate vicinity thereof. . 2. The device according to claim 1, characterized in that a capacitor 21 is connected in series with the converter 12, and a low threshold voltage diode 22 is connected antiparallel to the converter 12. . 3. The device according to claim 1, characterized in that a capacitor 21 is connected in series with the converter 12, and a transistor is provided in parallel with the converter 12. 4. Device according to claim 1, characterized in that in series with the converter 12 a diode, in particular a Zener diode 18, connectable to the power supply is connected. 5. Device according to one of claims 1 to 4, characterized in that the variable magnetic field generator is designed as a movable permanent magnet 13. 6. Device according to one of claims 1 to 4, characterized in that the variable magnetic field generator is designed as a movable electromagnet 13. 7. Device according to one of claims 1 to 4, characterized in that the variable magnetic field generator is designed as a stationary magnet 13 with a movable magnetic short-circuit device. 8. Device according to one of claims 1 to 7, characterized in that the light guide 6 is made of glass. 9. Device according to one of claims 1 to 7, characterized in that the light guide 6 is made of plastic. 10. Device according to one of claims 1 to 9, characterized in that the light guide 6 consists of a single fiber or a fiber bundle. 11. Device according to one of claims 1 to 10, characterized in that the electro/optical converter 12 is designed as a diode, in particular a light-emitting diode or a laser diode. 12. Device according to one of claims 1 to 11, characterized in that the receiver 14 is designed as a photodiode or a phototransistor. 13. One of claims 1 to 12, characterized in that the amplifier 15 and the pulse shaper 16 are configured as an integrated circuit (IC).
The equipment described in section. 14. Device according to one of claims 1 to 13, characterized in that the receiver 14 and the amplifier 15 are included in an integrated circuit (IC).